For this current IDOT contract INTERRA is providing Phase III professional engineering services which includes Quality Assurance services for Portland Cement Concrete (PCC), hot mix asphalt (HMA), Aggregate Gradation Control System (AGCS), Recycled Asphalt Paving (RAP) testing, Recycled Asphalt Shingles (RAS) testing, pipe, precast, and prestressed inspections as needed for IDOT.